Coach TF, join all those who admired your insight, your comprehension of/expertise in the technical side of the game, and ability to relay your thoughts with such clarity. No wonder your coaching career spanned some thirty years, and your influence upon so many players has been so positive.
Like many others, agree with a majority of almost everything you have shared here. Would add this to what you said about Tom Nobis. Was fortunate enough to have him as a teammate back then and a friend now. Almost nothing I experienced in this game was quite as overwhelming as lining up against him during practice. In those years, we were all trained in 2 positions: one on offense and one on defense. His offensive position was RG, but the term then for guards was either strong/quick offensive guard. Although his legendary legacy was at LB, he sometimes played guard, especially when we were kicking the ball. As another teammate of mine said, "facemask and freckles" was all you saw and then sky or stars after a collision with Nobis.
In "protecting the kick" drills, Tom eventually started grabbing people by the jersey. Fact was, there just was no one who could have creased the gap between guard and center with Nobis sealing to the inside. So, he on his own initiative, grabbed us to avoid pointless head butting--yeah, holding, but he saw no reason in possibly injurying another teammate. The coaches just watched, some smiling at the obvious fact that this fellow was in a league by himself and was quite prepared for games--but had reached a plausible conclusion on how to proceed in that aspect of practice.
UT practice did go full speed, but not in the amount or frequency that some responders think we did then or want done now--and NEVER 1st team defense against 1st team offense in any practice situation. Not in the spring scrimmages, not in fall two-a-days. Sure, in drills a first teamer would come up against another starter, but not in scrimmage situations. Implied by some is that if you don't go full speed in practice against your equal, you won't know how to at real game time. I doubt seriously that anybody out there would accuse Coach Royal, Coach Campbell, Coach Shira, Coach Pittman or any of the rest of the staff of being too soft on the players or negligent in teaching proper techniques because of their realistic approach to managing the hitting intensity in practice or even bowl game preparations. Nor, hopefully, would anyone accuse the likes of Nobis, Talbert, Howe, or Appleton of faulty tackling technique because they weren't turned loose against starting teammates. Ask Joe Namath or Roger Staubach.
Now against reserves like me who were expendable--that's a different story; I still remember the rib pain among others prior to the '63 game against Navy. My body knew "We were ready!" That was the job of the scout team; run the oppositions plays and incur the wrath.
Have read that OU now advocates putting the best against the best in spring practice and even in the fall; maybe so, but maintain that Coach Royal knew what full speed from guys like Nobis, Culpepper, the Talbert's, Bedrick, Howe, and Appleton among others could do to the future of key players injury-wise. And too, we suited up only 47 on the traveling squad verses what is being done now.
Injuries were a killer factor during my three varsity years. Had Jim Hudson among others been healthy for the '64 Arkansas game, I'm certain our winning streak would have continued, and we would have enjoyed back to back NC's.
Most of you folks really know your stuff. Coach TF certainly knows his. Have tried to lend perhaps a little to the mix from past experiences--to suggest the answer may not lie in full speed ahead 1st team against 1st team--or some suggestions that tackling is an exact science rather than situational. Perfect form tackling when you know it can cause a loss or a fumble with support behind you is a different animal than when you are the last defender between you and the goal line. Grab, wrestle, hang on, whatever it takes, but just don't let him get away.
And would suggest that the caliber of the coaches who teach the fundamentals and the attitude of the players that once you've been taught, you'd better sure as hell not forget, is the most cogent part of this discussion . Like TF said, our DC "faces some tough challenges." But full speed is not as black and white an answer on the field as it may appear in internet print.